.
1 lubrication system
Introduction:
is an integral part of the lubrication system of the engine, its role is: lubrication, cooling, cleaning, sealing, cushioning.
The basic task of the lubrication system are: continuous conveyance of the cleaning oil to the friction surfaces of engine parts to reduce friction and wear of the parts; the oil flow can take away the heat generated by mechanical friction and wear of grinding down to metal chips to prevent mechanical temperature rise, damage caused by adverse consequences with the gap, and also prevents abrasive wear of the parts; the presence of lubricating viscosity and the adsorption film is formed, and therefore oil can act as a seal. Seen in this light, the engine lubrication system to ensure the normal operation is one of the important conditions.
Composition:
lubrication system mainly by the oil pump, pressure limiting valve, oil filter, oil cooler and other parts.
Oil Pump:
Function oil pump in the lubricating system are: to improve the oil pressure and suction pressure supplied to the friction surface of the engine, while promoting the circulation of oil. Oil pump mechanism which is: Since the gear pump gear wheel teeth to engage and withdraw it into engagement, causing the volume of the suction chamber and the discharge chamber changes, the volume of the suction chamber is increased suction force is generated when the engagement of the gear teeth suction exit, reducing the volume of discharge chamber pressure generating gear teeth into engagement when the discharge of oil. As the pump pressure can be generated, primarily due to the oil pressure in the lubrication system of the drive section have flow resistance caused. Thus, the lubrication system oil pressure from the oil pump depends on the level of the end of the flow resistance. If the flow from the pump end of the lubrication system resistance, high oil pressure. Conversely, low pressure oil flow resistance is small.
The oil pump equal to the theoretical fuel pump pumps the fuel pump minus the amount of leakage. If a gas leak amount increases, the decline in the effective fuel pump, i.e., reduce the output oil pressure is reduced.
Oil Filter:
Oil FilterThe oil filter is acting: stick itself and the filtered oil into the gum mechanical impurities as well as the oil itself, generated from mechanical impurities with the oil flows friction surface abrasive wear or clogging pipes.
heat sink:
to dissipate heat sink temperature of the oil is absorbed, so that it remains at 70deg; ~ 90 ℃, and oil viscosity will not change much, to ensure that the parts normal lubrication.
The oil cooler is the rated power and the operating characteristics of the engine be provided. Large diesel engine power is provided an air-cooled oil cooler or a water-cooled oil cooler, small power diesel engines mostly rely on oil bottom heat.
a pressure limiting valve:
is a pressure limiting valve for limiting lubrication system oil pressure does not exceed a predetermined value of technical documents, to prevent damage to the seal. It mainly consists of the balance spring and ball valve (or poppet) or the like. Its working principle is: the pressure limiting valve is balanced by the spring and ball (or poppet) to limit the oil pressure of the oil pressure does not exceed the value of the technical documents. When the oil pressure exceeds a predetermined value, it overcomes the spring force of the relief valve open so that the system, when the oil pressure is lower than the spring force, the valve is closed again under the action of the spring.
basic cycle oil:
Basic circulating oil lubrication system is a series-parallel circuit, i.e. the end of the oil to the main oil passage which passage section in series , transmission gears, crankshafts, camshafts, rocker arms, oil filter and fine as the parallel pressure limiting valve passage. Basic cycle oil is: a bottom oil strainer – an oil pump a strainer in parallel a main oil passage (transmission gears, crank journal, the journal of the camshaft, the rocker arm shaft, and the oil pressure limiting fine filter valve) a bottom oil.
Lubrication:
Some of the crankshaft main bearings, a cylinder, a piston pin, a cam valve, pusher, etc., are by splash lubrication.
engine equipped with a turbocharger, branched off from the main oil-based lubricating oil for lubrication of the turbocharger, and then flows back to the bottom oil.